Anmerkungen Jörg H. Gleiter, Ludger Schwarte

Gleiter, Jörg H.; Schwarte, Ludger

doi:10.14361/transcript.9783839424643.237

Cited by 6 publications

(8 citation statements)

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“…1b illustrates the cyclic voltammograms for the SnO 2 electrode in the unitary Se system containing 2.5 mM H 2 SeO 3 and 10 mM KSCN. For the H 2 SeO 3 solution, the curve displays two cathodic peaks at −0.17 V and −0.61 V. In combination with previous studies, 40,41 the weak cathodic wave with the peak at about −0.17 V corresponds to the selenium deposition through the four-electron reduction of Se(IV) to Se(0) proceeded by eqn (3). Another cathodic wave with a peak at about −0.61 V corresponds to the six-electron reduction of Se(IV) to Se(−II) according to eqn (4).…”

Section: Cyclic Voltammograms Of the Unitary Bi And Se Systems And Th...supporting

confidence: 73%

“…For example, fundamental electrical and optical properties such as the electrical conductivity and band gap of semiconductors, can be tuned to a satisfied level as the material size evolves from bulk phases to nanostructures. [1][2][3][4] In the past few years, nano-scaled materials have found extensive potential applications in thermo and optic devices, 5,6 electronics, 7 magnetics 8 and catalysts. 9 Nanostructures cover nanoparticles, nanorods, nanowires, nanotubes, nanobelts, quantum dots, etc.…”

Section: Introductionmentioning

confidence: 99%

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The electrochemical self-assembly of hierarchical dendritic Bi2Se3 nanostructures

et al. 2014

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Bismuth selenide (Bi 2 Se 3 ) has proven to be an important material in thermoelectric and topological insulator applications. We report here a simple electrochemical self-assembly route for the preparation of well-defined hierarchical dendritic Bi 2 Se 3 nanostructures. Cyclic voltammetry was used to study the electrochemical reactions relevant to the growth of the prepared bismuth selenide. The compositional, morphological and structural properties of the deposited nanostructures were characterized using energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-Ray Photoelectron Spectroscopy (XPS). The band gap of the prepared Bi 2 Se 3 dendritic nanostructures was estimated to be 0.50 ± 0.01 eV by a UV-VIS-NIR spectrophotometer and the dendritic Bi 2 Se 3 nanostructures showed an excellent photoelectrochemical activity. Additionally, based on the investigation on the evolution of the morphology and composition during electrochemical growth, a possible formation mechanism of the dendritic structures was concluded. Furthermore, the effects of some synthesis conditions on the morphologies of the deposited bismuth selenide nanostructures were studied.

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Section: Cyclic Voltammograms Of the Unitary Bi And Se Systems And Th...supporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

The electrochemical self-assembly of hierarchical dendritic Bi2Se3 nanostructures

et al. 2014

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“…Relaxation of the grain boundaries reduces the excess volume, the lattice distortion decreases and long-range strains decrease as well. Grain growth in nc materials can occur at temperatures 0.4 times the melting temperature Tm and even lower [54,55]. The domain size, the lattice parameter and the microstrain is nearly unchanged during annealing at 200°C and 300°C, which clearly indicates that no recovery of the microstructure or decomposition of the formed ssss occurs at this lower annealing temperatures.…”

Section: Microstructural Evolution During Annealing and Hardening By ...mentioning

confidence: 98%

New insights on the formation of supersaturated solid solutions in the Cu–Cr system deformed by high-pressure torsion

et al. 2014

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In the Cu-Cr system, the formation of supersaturated solid solutions can be obtained by severe plastic deformation. Energy-dispersive synchrotron diffraction measurements on as-deformed Cu-Cr samples as a function of the applied strain during deformation confirm the formation of supersaturated solid solutions in this usually immiscible system. Due to evaluation of the diffraction data by a newly developed energydispersive RIETVELD-program, lattice parameter and microstructural parameters like domain size and microstrain are determined for as-deformed as well as annealed samples. The obtained information is used to deepen the understanding of the microstructural evolution and the formation of supersaturated solid solutions during severe plastic deformation. Complimentary transmission electron microscopy investigations are furthermore performed to characterize the evolving microstructure in detail. After annealing at elevated temperatures, the formed solid solutions decompose. Compared to the as-deformed state, an enhanced hardness combined with a high thermal stability is observed. Possible mechanisms for the enhanced hardness are discussed. Published inActa Mater Volume 69 (2014), Pages 301-313 http://dx.

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“…Their enhanced properties can be attributed to the high density of grain boundaries, which is usually quantified indirectly by grain size. Indeed, grain size has been the fundamental metric used for the creation of nanocrystalline structure-property scaling laws to this point [4]. However, recent studies have highlighted the importance of also considering boundary type and topological arrangement [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline grain boundary engineering: Increasing Σ3 boundary fraction in pure Ni with thermomechanical treatments

2015

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Grain boundary networks should play a dominant role in determining the mechanical properties of nanocrystalline metals. However, these networks are difficult to characterize and their response to deformation is incompletely understood. In this work, we study the grain boundary network of nanocrystalline Ni and explore whether it can be modified by plastic deformation.Mechanical cycling at room temperature did not lead to structural evolution, but elevated temperature cycling did alter the grain boundary network. In addition to mechanically-driven grain growth, mechanical cycling at 100 °C led to a 48% increase in Σ3 boundaries, determined with transmission Kikuchi diffraction. The extent of boundary modification was a function of the number of applied loading cycles and the testing temperature, with more cycles at higher temperatures leading to more special grain boundaries. The results presented here suggest a path to grain boundary engineering in nanocrystalline materials.

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Anmerkungen Jörg H. Gleiter, Ludger Schwarte

Cited by 6 publications

References 0 publications

The electrochemical self-assembly of hierarchical dendritic Bi2Se3 nanostructures

The electrochemical self-assembly of hierarchical dendritic Bi2Se3 nanostructures

New insights on the formation of supersaturated solid solutions in the Cu–Cr system deformed by high-pressure torsion

Nanocrystalline grain boundary engineering: Increasing Σ3 boundary fraction in pure Ni with thermomechanical treatments

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